MCQ
$K^+, Cl^-, Ca^{2+}$ and $S^{2-}$ ions are isoelectronic. The decreasing order of their radius is
- ✓$S^{2 -} > Cl^-> K^+ > Ca^{2+}$
- B$Ca^{2+} > K^+ > Cl^-> S^{2-}$
- C$K^+ > Cl^-> Ca^{2+} > S^{2-}$
- D$Cl^-> S^{2-} > Ca^{2+} > K^+$
as per ${Z_{eff}}$
${Z_{eff}}\, \uparrow \uparrow \,A.R\, \downarrow \downarrow $
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